5. Which statements correctly describe sound? (Select all that apply.) Sound travels as waves through a medium.
All sound has the same wavelength and frequency.
As an object vibrates, it causes the air near it to vibrate inwards.
Sound waves are like ripples on a pond because they radiate outward from a central point.

u i forgot the answer?

ill try to . no promises tho.

explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.